Concrete-mold.



E. TJ BARRETT. CONCRETE MOLD.

APPLICATION FILED DEC-M1916. 1262,919. Patented Apr. 16,1918.

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UNITED %TATE% PATENT @FFTQE.

EDWIN T. BARRETT, OF NEWARK, NEW JERSEY.

CONCRETE-MOLD.

Application filed December 1, 1916.

T 0 all whom it may concern:

Be it known that I. EDWIN T. BARRETT, a citizen of the United States, and a resident of Newark, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in Concrete- Molds, and do hereby declare the following specification, taken in connection with the drawings forming part of same, to be a full, clear, concise, and exact description of the invention and the best mode contemplated to apply the principle thereof, so as to distinguish it from other inventions and to enable any person skilled in the art to which it appertains or with which it is most nearly connected to make, construct, and use the same.

This invention relates primarily to an adjustable concrete mold and more particularly to a mold which is suitable for forming surfaces, girders and prismoidal or polygonal columns and is built up by connecting a number of similar metal members.

The primary object of this invention is to provide a flexible and durable concrete mold for columns or plain surfaces consisting of individual members or sections, preferably composed of metal and so united as to give the required form and be easily dismantled after the concrete has been poured.

Another object is to improve the method and reduce the time required in building the molds and dismantling after their purpose has been served.

This invention contemplates primarily a plurality of over-lapping T members or sections joined by suitable interlocking devices to form a surface or surfaces. The interlocking devices are so arranged that the mold can be readily dismantled after the concrete has been poured. Lap joints are preferably used for making a surface and butt joints for making columns of various cross sections. The T members may be luilt up of sheet metal or structural steel or made integral of cast iron.

Other objects will be apparent from, and are incorporated in the annexed drawings, and in the following description, which sets forth in detail certain constructions embodying means, constituting, however, but one of the various mechanical forms in which the principle of this invention may be used.

The novelty of this invention will be read- Specification of Letters Patent.

Patented Apr. 16, 1918.

Serial No. 134,483.

ily understood from the drawings, which show a construction for practising the invention in its preferred form, and from the following description thereof, and is more, specifically pointed out and distinctly claimed in the claims annexed to said description.

In the drawings Figure 1 is an isometric view of the invention showing two T shaped sections joined to make a lap joint.

Fig. 2 is an end view illustrating on the right how the forms are dismantled and on the left how a column is formed.

The drawings illustrate the invention as consisting of a plurality of members or sections each built from individual portions of sheet metal, but it is to be understood that each of these members may be made inte ral from cast iron.

Referring to Fig. 2, the fiat portion 1 of the T member is the part that is adjacent to the concrete and determines the form. An L piece 2 is secured to said flat portion 1 to form the stem of the T section and reinforce the same. Hook shaped members 3 arev suitably secured by rivets or bolts to the L member 2 and may also be se cured to the flat portion 1. Locking plates 4 are suitably secured by rivets or bolts to the fiat member 1 and are provided with L slots 5 so arranged that the hook members 3 of an adjoining portion of the mold can engage said L slots 5 and interlock two of the T shaped sections of the mold.

The molds are built up for flat surfaces by having the flat portions 1 over-lapping and for columns the fiat portions 1 are slightly narrower, so as to make butt joints. When the flat portions are made narrower as stated to form butt joints. they are also useful for making concrete columns of prismoidal or polygonal forms as partly shown on the left in Fig. 2.

The individual T members are assembled by sliding two members end-wise so that the hook portions 3 will enter the L slots 5 at 6 and then drawing the members laterally to engage and lock as shown in Fig. 1. To dismantle the mold the assembling operation is not reversed, but is accomplished which results from the use of wood for these molds as now practised. Furthermore, when using Wood it is diflicult to make a suitable lap joint Without having large depressions in the mold and when butt joints are made of wood, there is generally a considerable space between the adjacent pieces of wood so that the thin and best part of the concrete will escape instead of being part of the finished Work. By using the metal form, the butt joints can be made to fit much closer and therefore prevent the escaping of the thin concrete.

Another disadvantage of using Wood for concrete molds is that as the wood is dry and then becomes wet it will be considerably distorted in shape and consequently the form will be altered to that extent. 7

Having described my invention I claim as new, and desire to secure by Letters Patcut:

1. In a concrete mold, a plurality of simi lar members adjacent to each other, locking plates being part of each of said members and provided with L slots therein, and devices consisting of hooks also part of said members and cooperating with the L slots in said locking plates to secure said members to each other.

2. In a concrete mold, a plurality of T 3. In a concrete mold, a plurality of similar members adjacent to each other to form the mold, each of said members provided with a flat portion, locking plates arranged upon said members to form an opening be tween said locking plate and flat portion and devices secured to each of said members and arranged to extend between the flat portion and locking plate of an adjacent member to secure said members to each other to form the mold and allow the mold to be rolled away from the concrete.

Signed this 28th day of November, 1916.

EDWIN T. BARRETT.

Copies at this patent may be obtained for five cents each, by addressing the Commissioner of Eatents,

Washing-tun, I). C. 

